What should I do if the ajax return value of jquery is Chinese garbled code?

/**
* 异步（返回json数据格式）（支持分页）
* @param mapping
* @param form
* @param request
* @param response
* @return
* @throws AppException
*/
public ActionForward queryErrorCodeRecordByPage(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
Integer currentpage = Integer.parseInt(request.getParameter("currentpage")) ;
Integer pagesize = Integer.parseInt(request.getParameter("pagesize")) ;
try 
{
List ListByPage = this.errorCodeRecordFacade.queryErrorCodeRecordByPage(currentpage, pagesize);
JSONArray json = JSONArray.fromObject(ListByPage);
System.out.println("JSONArray数据---" + json.toString() );
request.setCharacterEncoding("utf-8");  //这里不设置编码会有乱码
        response.setContentType("text/html;charset=utf-8");
        response.setHeader("Cache-Control", "no-cache");  
PrintWriter out = response.getWriter();  //输出中文，这一句一定要放到response.setContentType("text/html;charset=utf-8"),  response.setHeader("Cache-Control", "no-cache")后面，否则中文返回到页面是乱码  
out.print(json.toString());
out.flush();
out.close();
} 
catch (Exception e) {
log.error("查询数据出错", e);
}
return null ;
}

//异步 根据分页来取错误码历史 数据
function search_errorCodeRecord(currentpage,pagesize)
  {
       $.ajax({
          async :true,
  url: "<%=request.getContextPath()%>/errorCodeRecord/queryErrorCodeRecordByPage.do",
  type: "post",
  data: { currentpage: currentpage, pagesize:pagesize},  
//  dataType : "json", //这里已经定义数据格式
      contentType: "application/x-www-form-urlencoded; charset=utf-8", 
  success:function(data) {
          alert(data);
  //  var json=eval(&#39;(&#39;+data+&#39;)&#39;);   // jquery调用时会检测到，从而直接把返回格式当做json处理，所以再转化会报错。
    var json=eval(data);
   resolv_json(json) ;
   }
});
     }
 
 
 //解析json数组，动态拼接到白色Div中
 function resolv_json(json)
 {
    for(var i=0;i<json.length;i++)
    {
      //  alert(json[i].boss_resultinfo);
      
      var operate_state = "新增了" ;
      if(json[i].operate_state  == "2" )
      {
operate_state= "修改了"  ;
      }
      if(json[i].operate_state  == "3" )
      {
operate_state= "删除了"  ;
      }
      var p=$("<p></p>");
      var span1=$("<span></span>");
      var span2=$("<span></span>");
      var span3=$("<span></span>");
      var span4=$("<span></span>");
      
      var times = json[i].operate_time.time;
    //  alert(json[i].operate_time.time); //时间格式是个JSON对象
//  alert(getLocalTime(times));
      span1.html(getLocalTime(times));
      span2.html(json[i].operate_people);
      span3.html(operate_state);
      span4.html(json[i].businessname +" 错误码");
      
      p.append(span1).append(span2).append(span3).append(span4);
      $("#whiteDiv").append(p);
    }
 
 }
 
//时间戳转化为时间
function getLocalTime(nS) {
    return new Date(parseInt(nS)).toLocaleString().replace(/:\d{1,2}$/,&#39; &#39;);
}
 
 
<div  id="whiteDiv">
 
</div>

request.setCharacterEncoding("utf-8");  response.setContentType("text/html;charset=utf-8");

contentType: "application/x-www-form-urlencoded; charset=utf-8",